Delta V112

The Groovesizer Delta is a lo-fi granular monosynth attached to a 32-Step sequencer

The Delta firmware is based on the Auduino granular synth that Peter Knight wrote for the Arduino platform. The Auduino synth engine is also the basis of the original Groovesizer mk1. Unlike the Groovesizer Alpha which outputs sound via the onboard DAC, the Delta produces sound by means of PWM.

Want to look at the firmware code or change it? Be our guest! You’ll need the Arduino IDE to edit, compile and upload the firmware.

Download the current firmware version and see the included README file for further instructions: Groovesizer_Delta_112

To run the Delta firmware successfully, make sure you have the jumpers on the options header configured as follows:

All set?

Groovesizer Delta – Manual v.1

The Groovesizer Delta has three operating modes: Edit Mode, Trigger Mode and Pot-shift Mode, and a Preferences Page.

On first turning on, you’ll be in

EDIT MODE (neither Shift L or Shift R is lit):

Pot Behavior

Pot 1 – Grain 1 phase increment – similar in use to filter cutoff. With Shift R pressed, record automation for Pot 1.

Pot 2 – Grain 1 decay – similar in use to filter resonance.

Pot 3 – Grain 2 phase increment.

Pot 4 – Grain 2 decay

Pot 5 – Release time.

Pot 6 – Pitch for selected steps.

Button Behavior

Step SelectPage (F1 is lit – the default page when the Groovesizer is switched on) – Press any button from 1 – 32 to select the corresponding sequencer step. Selected steps are indicated with a fast blink. Change the pitch of selected steps with Pot 6. Deselect a step by pressing it again.

Stop/Start/Rewind (F1) – If you’re already on the step select page, pressing F1 will stop playback. Pressing F1 again will restart playback from the first step. When playback is stopped, you are able play the Delta as a MIDI module via an attached MIDI keyboard, and also to enter notes into the sequencer – to do so, make sure you have the Note Entry option selected on the preferences page (see below).

Clear All Selected (Shift L & F1) – Clear all selected steps by holding Shift L and pressing F1. This also works for mutes, ties and slides.

Step Tie Page (F3) – Active steps are lit. Press a step after an active step to tie it to the preceding step. Steps can also be tied to other tied steps. Tied steps are indicated with a fast blink. Clear a tie by pressing the step again.

Step Slide Page (F4) – Active steps are lit. Select the first of two consecutive active steps to slide in pitch from the first to the second. If the step after a Slide step is not active, the step will slide down to a pitch value of zero. Slide steps are indicated with a fast blink. Clear a slide by pressing the step again.

Pattern Transpose Down(Semitone) (F5) – Press F5 to transpose the whole pattern down by a semitone.

Random Pattern (Chromatic) (F1) – Press F1 to create a random pattern. A step can be any interval from an octave below to an octave above the preceding step.

Random Pattern (Major) (F2) – Press F2 to create a random pattern in a major scale. Pattern generation is weighted so there’s a larger probability that the pitch of a step will be one of the major triad. The root note is the last note value that was assigned in edit mode. (To change the root note, in other words, hop back into edit mode, select a step, and assign it the desired pitch with Pot6.)

Random Pattern (Minor) (F3) – Press F3 to create a random pattern in a major scale. Similar to pattern generation in the major scale, there’s a larger probability that a step’s pitch will be of the minor triad. The root note is the last note value that was assigned in edit mode.

Infinite Random (Shift L & F1 – F4) – The same as above, but on reaching the end of the pattern a new random pattern is generated. The LED for the appropriate scale will be lit to indicate infinite random mode.

Transpose Selected Down(Semitone) (F5) – Press F5 to transpose any selected steps down by a semitone.

Tap Tempo (F6 – no steps selected) – With no steps selected, tap F6 repeatedly to set the tempo.

Accent Page (F5 – no steps selected) – With no steps selected, press F5 to enter the accent page. Toggle step select buttons 1 – 32 to add an accent to or remove an accent from a step. While on the accent page, use Pot2 to adjust the accent level. Press F5 again to exit the accent page.

Tempo Nudge Slower (Shift R & F5) – With Shift R held, pressing F5 will slow the current tempo down by 1 bpm. The current bpm will be displayed. (When displaying numeric values, values over 99 are indicated with the LED for Shift L lit. Values over 199 are indicated with the LEDs for both Shift L and Step 25 lit. ) When the Groovesizer is slaved to MIDI clock, the same button combination will shift pattern playback on this unit 1 ppq (pulses per quarter) later relative to the master (the latter feature is best illustrated in this video).

Tempo Nudge Faster (Shift R & F6) – With Shift R held, pressing F6 will speed the current tempo up by 1 bpm. The current bpm will be displayed. When the Groovesizer is slaved to MIDI clock, the same button combination will shift pattern playback on this unit 1 ppq (pulses per quarter) earlier relative to the master.

TRIGGER MODE (Shift L is lit – Toggle with Shift L):

Pot Behavior

Identical to Edit Mode, with the exception that automation can only be recorded in Edit Mode.

Pattern Recall (Button 1 – 32) – The buttons from 1 – 32 each represents a pattern save location (page 4 exluded – see above). If a pattern is stored in a location its LED will be lit. Cue a pattern to play next by pressing it’s button. A pattern currently playing will be indicated with a slow blink. The pattern cued to play next is indicated with a fast blink. Pattern selection is quantized to the closest bar – it means the pattern will only change once step 1 or step 17 is reached.

Pattern Save (Long-press button 1 – 32) – Long-press a location to store the current pattern there. If the location is not currently occupied, the pattern will be stored immediately. Once step 1 or 17 is reached (pattern recall is quantized to the closest bar), the location will start to slow-blink to indicated that it is currently playing. If the location is already in use (ie. a pattern is already stored there), the location will fast-blink to indicate that it’s waiting for confirmation. Press the location again to overwrite the pattern stored there with the current pattern. Press any other button to cancel the save request.

Clear Save Location (Shift L & button 1 -32) – To clear a save location and permanently delete the pattern stored there, hold Shift L and press the location. It will fast blink to show it’s waiting for confirmation. Press the location again (no shift) to confirm, or anything else to cancel.

Pattern Reverse (F1) – Press F1 to reverse the playback of the pattern.

Step Repeat (F2) – The current step will be repeated as long as F2 is held down.

Random Step (F3) – The following step will be randomly selected as long as F3 is held.

Pattern Chaining: Return To Head (Shift L & F5) – Use this to mark the last pattern in a chain. When F5 is lit, the pattern marked as the head of a pattern chain will be loaded and played once playback reaches the end of the current pattern. The last pattern selected is marked as the head of the chain. The pattern has to be re-saved before pattern chaining takes effect. After saving, the pattern will continue to loop until a preceding pattern is selected as the head of the pattern chain.

Pattern Chaining: Next Pattern (Shift L & F6) – When F6 is lit, the following pattern will be loaded and played once playback reaches the end of the current pattern. The pattern has to be re-saved before pattern chaining takes effect. If the following pattern location is empty, the current pattern will loop instead.

True Step (F6) – When using functions like Pattern Reverse and Step Repeat, the sequencer deviates from the actual current step. For example, if the Groovesizer is synced to another device and both are on the same step, pressing Step Repeat once will cause the Groovesizer to lag behind the synced device by a step. To realign the Groovesizer and make it snap back to the true step, press F6.

Sync Out (F1) – With the F1 led lit, the Groovesizer sends out MIDI timing clock messages (also known as MIDI beat clock) at 24ppq (pulses per quarter). Enable this option if you want to slave other MIDI devices (eg. more Groovesizers) to this unit. NOTE: the options to send Sync Out (F1) or Automation Out (F2) are mutually exlusive.

Automation Out (F2) – If the F2 led is lit, any recorded automation is sent out via MIDI as control change messages when the sequence is playing. Automation is sent at 24ppq (pulses per quarter note). By default, Automation is sent on MIDI channel 1 and on MIDI cc16 (General Purpose Controller 1). Select a different MIDI channel by holding F2 and adjusting the channel with Pot 6 – when the value is set to 00, Automation Out will follow the channel set for Note Out (see below). Select a different MIDI cc by holding F2 and selecting the desired cc with Pot 5.

Note Out (F3) – With this option selected (F3 led is lit), sequencer notes are sent out via MIDI during playback. You may want to switch this off if you are chaining Groovesizers and only want notes from one unit to be sent out by the last unit in the chain (by default, the Groovesizer echoes all MIDI messages it receives at its input). By default, notes are sent out on MIDI channel 1. To change the MIDI channel, hold F3 and select the desired channel with Pot 6.

Note Entry (F4) – Choose this option (F4 led is lit) if you want to enter note sequences with an attached MIDI keyboard. To do so, the Groovesizer should be in Edit Mode and the sequence should not be playing (stop sequence playback with F1). Incoming MIDI notes are assigned to consecutive steps in the sequencer and the led for the current step will be lit. For Note Entry, the Groovesizer will listen to incoming notes on any MIDI channel, except the channel selected for Trigger Out (see below). You will also hear the notes as you enter them , so use this setting to play the Groovesizer live. With Note Entry switched off, the Groovesizer responds to incoming MIDI note messages by transposing the current pattern. See the MIDI Transpose section for details.

Trigger Out (F5) – With F5 lit, the Groovesizer sends out pattern change messages. When the user changes a pattern in Trigger Mode on this device, any slaved Groovesizers will also change to the corresponding pattern (provided the slave has a pattern stored in that slot). The default MIDI channel for sending and receiving pattern trigger messages is 10. Change this to your desired channel by holding F5 and selecting the channel with Pot 6.

Notify (F6) – With the F6 led lit, the Groovesizer will send notifications via scrolling text when turning on the device, as well as to identify options on the preferences page. (Turn this off if you don’t want to see the firmware message every time you turn the Groovesizer on.)